Tool-post for lathes.



No. 670,546. Patented Mar. 26, I91. R. M. RUSSELL.

(Application filed J'uhe 2a, 1900.)

(No Model.)

UNITED STATES PATENT Unmet...

ROSS M. RUSSELL, OF BINGHAMTON, NEW YORK.

TOOL-POST FOR LAITHES.

SPECIFICATION forming part of Letters Patent No. 670,546, dated March 26, 1901.

Application filed June 23, 1900.

T at whom it may concern:

Be it known that I, Ross M. RUSSELL, a citizen of the United States, residing at Binghamton, in the, county of. Brooms and State of New York, have invented a new and useful vide means for reducing friction between the tightening-phi g and the nut which carries the tool-clamping screw.

My invention consists in the peculiar construction and combination of devices hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is aside elevation of a tool-post for lathes constructed in accordance with my invention. Fig. 2 is a vertical sectional view of the same, taken on the line a a of Fig. 1. Fig. 3 is a horizontal sectional view of the same, taken on the line b b of Fig. 2. Fig. 4 is a detail perspective view of the nut which carries the tool-clamping screw.

The lathe-carriage, a portion of which is indicated 'at A, is of the usual. form. The tool-post 1 is secured to the lathe-carriage in the usual manner, and the usual annulus O, which supports the lower side of the tool D, surrounds the base of the tool-post. The latter has the usual transverse openings 2', through which the tool D passes.

The post 1 is provided in its upper portio with the bore 3, the upper portion of which bore is screw-threaded, as at 4. The toolclamping screw 5 is carried by the cylindrical nut 6, which fits in the lower portion of the bore 3 of the tool-post and is provided on one side witha vertical groove 7, which is engaged by a pin 8, which projects into the bore 3. Thereby the cylindrical nut 6 is adapted to move vertically in the bore of the toolpost and is prevented from rotating therein. A ring 9 is disposed above the cylindrical nut 6 and is of the same diameter as the said'cylindrical nut and fits snugly and is adapted to move vertically in the bore of the tool-post. The central opening of the ring 9, through Serial No. 21,372. old model.)

which the tool-clamping screw passes, is of greater diameter than the clamping-screw,

and the said ring is adapted to move on the said clamping-screw and is not engaged thereby. A ball-race 10 is formed in the opposing sides of the nut 6 and ring 9, and bearingballs 11 are disposed in the said ball-race,

whereby friction between the ring 9 and the 6b cylindrical nut 6 is reduced to the minimum, as will be understood.

The tightening-plug 12, which is screwed into the threaded upper portion of the bore of the tool-post, is provided with a handle 13,

whereby it may be readily turned. If preferred, however, the said tightening-plug may I be provided with an angular head and adapted who turned by a suitable wrench. The tightening-plug does not engage the tool-clamping 7o The cutting-tool being placed in the opening 7 5 2 of the tool-post and adjusted to the required position the tool-clamping screw 5 is turned by the milled head 14 thereof, so as to cause the tool-clamping screw to engage the upper side of the tool. The tightening-plug 12 is 8o 7 then turned by its handle 13 and caused to descend in the upper portion of the bore of the tool-post and bear downward on the cylindrical nut 6, which carries the tool-clamping screw,-so asto tighten the latter and effectually clamp the tool in the opening 2 of the tool-post. The ball-bearing which is provided, as hereinbefore described, between thenut and the tightening-plug reduces friction between the same and increases the efficiency of the device, as will be understood. By unscrewing the tightening-plug 12 and lifting the same from the tool-post the tool-clamping screw, together with the ring 9,'cylindrical nut, and bearing-balls, can be taken from the tool-post and kept assembled in their correct relative positions. The ball-bearing is hence readily accessible together with the other operative parts of the device.

Having thus described my invention, 1 mo claim 1. The combination of the tool-post having the bore, smooth in its lower portion and with its upper portion screw-threaded, the nut 10- cated in the smooth lower portion of the bore, non-revoluble and adapted to play vertically therein, the tool-clamping screw, engaging and carried by the nut, and the tighteningplug screwed in the threaded portion of the bore, and adapted to. depress the nut, substantially as described.

2. The combination of the tool-post having the bore, smooth in its lower portion and with its upper portion screw-threaded, the nut located in the smooth lower portion of the bore, non-revoluble and adapted to play vertically therein, the tool-clamping screw, engaging and carried by the nut, the tightening-plug 

